Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Aids
Perform this test when directed by QUICK TEST. This system test is intended to diagnose:
- Barometric Pressure (BARO) Sensor
- Wiring Harness Circuits (BARO SIG, SIG RTN & VREF)
- Powertrain Control Module (PCM)
VREF voltage should be 4-6 volts. BARO PID reading is in frequency/volts.
| In. Hg (kPa) | Frequency (Volts) | Altitude Above Sea Level (Feet) |
|---|---|---|
| 3.5 (11.8) | 0.15 | N/A |
| 5 (16.9) | 0.40 | N/A |
| 10 (33.8) | 1.25 | N/A |
| 15 (50.7) | 2.10 | 14,000 |
| 20 (67.5) | 2.90 | 10,000 |
| 21 (70.9) | 3.10 | 9000 |
| 22 (74.3) | 3.30 | 8000 |
| 23 (77.7) | 3.50 | 7000 |
| 24 (81.1) | 3.62 | 6000 |
| 25 (84.4) | 3.80 | 5000 |
| 26 (87.8) | 4.00 | 4000 |
| 27 (91.2) | 4.14 | 3000 |
| 28 (94.6) | 4.30 | 2000 |
| 29 (97.9) | 4.50 | 1000 |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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